BEAM EXPANDER

A reflective beam expander from Precision-Optical Engineering can be used for analysis of large optics using the Interfire range of infrared interferometers from Optical Surfaces Ltd. The expander accessory features a Newtonian configuration, which provides an intermediate focused image to permit relaying of optical pupils. It has standard output apertures of 150 and 200 mm with custom sizes available, and can be bolted to an optical bench with height adjustment. It also contains a pair of magnesium-fluoride-coated aluminum mirrors that are permanently aligned internally.